principalfromrequestuserprincipalnoninteractivecredentialsaction.java

来自「CAS在Tomcat中实现单点登录项目,单点登录（Single Sign On 」· Java 代码 · 共 55 行

/*
 * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license
 * distributed with this file and available online at
 * http://www.ja-sig.org/products/cas/overview/license/
 */
package org.jasig.cas.adaptors.trusted.web.flow;

import java.security.Principal;

import javax.servlet.http.HttpServletRequest;

import org.jasig.cas.adaptors.trusted.authentication.principal.PrincipalBearingCredentials;
import org.jasig.cas.authentication.principal.Credentials;
import org.jasig.cas.authentication.principal.SimplePrincipal;
import org.jasig.cas.web.flow.AbstractNonInteractiveCredentialsAction;
import org.jasig.cas.web.support.WebUtils;
import org.springframework.webflow.execution.RequestContext;

/**
 * Implementation of the NonInteractiveCredentialsAction that looks for a user
 * principal that is set in the <code>HttpServletRequest</code> and attempts
 * to construct a Principal (and thus a PrincipalBearingCredentials). If it
 * doesn't find one, this class returns and error event which tells the web flow
 * it could not find any credentials.
 * 
 * @author Scott Battaglia
 * @version $Revision: 42053 $ $Date: 2007-06-10 09:17:55 -0400 (Sun, 10 Jun 2007) $
 * @since 3.0.5
 */
public final class PrincipalFromRequestUserPrincipalNonInteractiveCredentialsAction
    extends AbstractNonInteractiveCredentialsAction {

    protected Credentials constructCredentialsFromRequest(
        final RequestContext context) {
        final HttpServletRequest request = WebUtils
            .getHttpServletRequest(context);
        final Principal principal = request.getUserPrincipal();

        if (principal != null) {
            if (logger.isDebugEnabled()) {
                logger.debug("UserPrincipal [" + principal.getName()
                    + "] found in HttpServletRequest");
            }
            return new PrincipalBearingCredentials(new SimplePrincipal(
                principal.getName()));
        }

        if (logger.isDebugEnabled()) {
            logger.debug("UserPrincipal not found in HttpServletRequest.");
        }

        return null;
    }
}